5 instructions, 1 invocations

store_src_rg                   p = src.rg
init_lane_masks                CondMask = LoopMask = RetMask = true
copy_2_slots_unmasked          $0..1 = p
swizzle_2                      $0..1 = ($0..1).yx
exchange_src                   swap(src.rgba, $0..3)
invoke_shader                  invoke_shader 0